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File extensions for markup languages.

It's just a JSON file, so you can use it in any environment. Sourced from GitHub's Linguist project (defines all 69 markup languages known to GitHub). Data is updated via script and released via new package version.

Installation

pip install markup-languages

Usage

import markup_languages

html_lang_data = markup_languages['HTML']

print(html_lang_data['extensions']) # => ['.hta', '.htm', '.html', '.html.hl', ...]

Note: Most type checkers will falsely warn markup_languages is not subscriptable because they are incapable of analyzing runtime behavior (where the module is replaced w/ a dictionary for cleaner, direct access). You can safely suppress such warnings using # type: ignore.


Examples

Get language(s) from an extension:

def get_lang(file_ext):
    lang_matches = [
        lang for lang, data in markup_languages.items()
            if file_ext in data['extensions']
    ]
    return lang_matches[0] if len(lang_matches) == 1 else lang_matches

print(get_lang('.sss')) # => SugarSS

Get language(s) from a file path:

def get_lang_from_path(filepath):
    from pathlib import Path
    file_ext = Path(filepath).suffix
    lang_matches = [
        lang for lang, data in markup_languages.items()
            if file_ext in data['extensions']
    ]
    return lang_matches[0] if len(matches) == 1 else lang_matches

print(get_lang_from_path('index.html')) # => ['Ecmarkup', 'HTML']
print(get_lang_from_path('style.css'))  # => CSS
print(get_lang_from_path('script.js'))  # => [] (use programming-languages pkg)

MIT License

Copyright © 2026 Adam Lui


Related

🇨🇳 non-latin-locales - ISO 639-1 (2-letter) codes for non-Latin locales.
#! programming-languages - File extensions for programming languages.
🏷️ project-markers - Common project root markers.

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